FreeFileSync is a powerful backup tool for Windows, Linux and Mac that permits to save over the network to a WebDAV drive for example. They can be very useful with some cloud services like Box.com.

However, it’s best to use the comparison by size only, and not size AND date. The reason is that some WebDAV drives don’t support the date. So if you don’t choose “size only” then everything will be synchronized, all the time !

To do so, read the HelpFile of FreeFileSync: “Expert Settings”. They explain it’s possible to do “size only” in changing the FileTimeTolerance setting. Just close the program and edit the “GlobalSettings.xml” file (see the HelpFile to find where it’s located… on Windows it’s under %AppData%\FreeFileSync). Set the value to -1 (for the number of seconds).